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https://issues.apache.org/jira/browse/FLINK-2210?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14586216#comment-14586216
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ASF GitHub Bot commented on FLINK-2210:
---------------------------------------
Github user mxm commented on the pull request:
https://github.com/apache/flink/pull/834#issuecomment-112114140
For instance, users could wonder that a DataSet containing null values
returns a different result for a count aggregation than for a call to the
`count()` method.
> Table API aggregate by ignoring null values
> -------------------------------------------
>
> Key: FLINK-2210
> URL: https://issues.apache.org/jira/browse/FLINK-2210
> Project: Flink
> Issue Type: Bug
> Reporter: Shiti Saxena
> Assignee: Shiti Saxena
> Priority: Minor
>
> Attempting to aggregate on columns which may have null values results in
> NullPointerException.
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